The SMCN0288 cylinder neodymium magnet is made from high-performance N52 NdFeB, with Nickel coating. The dimension of this item is 3/16″ dia. × 1/4″ thick, magnetized through thickness, with a tolerance of ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.001875 lbs. It can pull up to 2.44 lbs steel. And the surface field is up to 6929 gausses.